CN101705317B - Harmless process method for chrome slag by utilizing metallurgy sintering and blast furnace - Google Patents
Harmless process method for chrome slag by utilizing metallurgy sintering and blast furnace Download PDFInfo
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- CN101705317B CN101705317B CN2009102538658A CN200910253865A CN101705317B CN 101705317 B CN101705317 B CN 101705317B CN 2009102538658 A CN2009102538658 A CN 2009102538658A CN 200910253865 A CN200910253865 A CN 200910253865A CN 101705317 B CN101705317 B CN 101705317B
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Abstract
The invention provides a harmless process method for chrome slag by utilizing metallurgy sintering and a blast furnace. In the method, chrome slag to be processed is taken as a raw material, coal dust or coke powder is taken as reducing agent, and adhesive serves as additive to prepare into a spherical core; the raw material of sinter ore or pellet ore is utilized to prepare into a spherical shell on the sintering production line or on the pellet ore production line to form a secondary pelletizing globule, and further to form sinter ore or pellet ore; sintering or roasting high temperature is utilized to lead the spherical core to form reducing atmosphere in the spherical shell, and preprocess on the chrome slag is realized, and thorough process is carried out on the chrome slag in the blast furnace, thus effectively processing the chrome slag by adopting conventional sintering and the blast furnace in the premise that oxidation ambient of the whole sintering is not changed, thereby the method is not only economic and environmental, but also is easy to be implemented.
Description
Technical field
The invention belongs to metallurgical ironmaking and chromium slag environmental protection treatment field.
Background technology
At present, the harmless treatment of chromium slag is had chemical method, physical/chemical method, fuses method and four kinds of methods of curing/stabilization method, the method that wherein fuses is the most thorough.The method of fusing is at high temperature by adding auxiliary agent to sexavalent chrome toxicide process with toxic substance.The innoxious process for treating that fuses of chromium slag mainly contains carbon reduction method, agglomerate method, dry type reduction method and cyclone furnace and fuses method.
Therefore the agglomerate method is the method the most completely of detoxifying because of also having a step blast furnace process after it.Simultaneously, because this method is in the smelter conventional device, subsidiary method of carrying out in the normal production process, so it also is most economical method.In addition, the valuable element in the chromium slag can also be fully utilized, and partly transfers among sintering, ironmaking produce as the value of chromium metal, iron, calcium, magnesium.
During blast furnace ironmaking, for the impurity SiO in iron ore and the coke
2, Al
2O
3Discharge from blast furnace with the liquation form, must add the white clouds masonry flux that contains CaO, MgO, with SiO
2, Al
2Thereby O generates the lower eutectic of fusing point reaches liquid purpose of discharging.And both content is suitable in the CaO in the chromium slag, MgO content and the rhombspar, Gu available chromium slag substitutes the flux of part rhombspar as sintered ironmaking.The agglomerate method that fuses innoxious process for treating of chromium slag is exactly to utilize the hexavalent chrome reduction in the sintering high temperature reduced chromium slag to be trivalent chromium (half way reduction-or high price detoxifcation reduction), and when blast furnace ironmaking, again trivalent chromium is reduced to simple substance chromium (omnidistance reduction-or utilize reduction at a low price), thereby realize the harmless treatment of chromium slag.This technology mainly comprises two processes:
The one, be basic flux and contain Cr materials with the chromium slag, allocate iron-bearing material and fuel (coal) such as iron ore powder into, make the agglomerate that contains chromium through sintering;
The 2nd, be main raw material with this agglomerate, through blast-furnace smelting, make and contain chromium pig iron (2.5-4%) or the pig iron is used in steel-making.
The domestic sintering process of having made self-fluxed sinter at the chromium slag that uses is, with the chromium slag is basic flux, substituting conventional lime that uses and iron-bearing material and fuel is mixed, and in sintering for agglumeration, make stronger reducing atmosphere, make fully effect such as the residual sexavalent chrome of chromium slag and reductive agent C and CO etc., the half way reduction is converted into trivalent chromium (with Cr
2O
3Form exist), hold concurrently and reach the purpose of reduction and detoxication.
In this technology, the sexavalent chrome in the chromium slag is reduced to trivalent chromium by half ways such as C, CO in sintering process, and reduction ratio can reach more than 96%.Behind blast-furnace smelting, expect blast furnace slag by sintering again, the hexavalent chrome reduction rate is more than 99.5%, and remaining trivalent chromium is with Cr
2O
3Form enter blast furnace slag, liquid blast furnace after shrend Quench granulated processed, can be used as the system cement raw material.
And the requirement of conventional sintering process is to guarantee to carry out under oxidizing atmosphere sintering, with the quality index (intensity, Well-recovered of guaranteeing agglomerate; FeO content is low).Therefore, there is following shortcoming in the domestic sintering process of having made self-fluxed sinter at the chromium slag that uses:
Its integral body has changed the atmosphere in the sinter machine, original strong oxidizing atmosphere has been become reducing atmosphere, under reducing atmosphere, FeO content will obviously increase, the reductibility of agglomerate is variation, and FeO increases by 1 percentage point, enter blast furnace after, the coke ratio of blast furnace will rise 1.5 percentage points, and molten iron output will descend 1.5 percentage points; Therefore lose more than gain, be difficult in big blast furnace, big sintering popularization.
Simultaneously, this method need change the processing that the sintering process condition realizes the chromium slag, in the metallurgy industry of large-scale production, is unpractical.
As seen, utilizing the sinter machine of smelter, blast furnace that the chromium slag is carried out pre-treatment and thoroughly processing, is a kind of method of effective safety economy.But the toxic substance sexavalent chrome in the chromium slag must could be by sound processing under high temperature, reducing atmosphere.Blast furnace is a high temperature reduction atmosphere, and sintering is a high temperature oxidation atmosphere, handle the toxic substance sexavalent chrome in sintering, realizes it being uneconomical by changing the whole atmosphere of agglomerating, also is inapplicable.
Summary of the invention
The objective of the invention is to deficiency at the prior art existence, a kind of new method metallurgy sintered and blast furnace carries out harmless treatment to the chromium slag of utilizing is provided, under the state that does not change metallurgy sintered oxidizing atmosphere, do not change metallurgy sintered and common process process blast furnace yet, realize the detoxifcation of chromium slag is handled.
Technical scheme of the present invention is as follows:
A kind of method of utilizing metallurgy sintered and production process blast furnace that the chromium slag is handled said method comprising the steps of:
(1) being raw material, being reductive agent with coal dust and/or coke powder or gravitational dust collection ash with the chromium slag, is additive with the caking agent in addition, is made into ball;
(2) described ball being made with the agglomerate raw material with the raw material of producing agglomerate and caking agent is the composite pellets of spherical shell, enters sinter machine and carries out sintering, forms agglomerate; Or described ball is entered the pellet production line make with pellet raw material and caking agent and think that pellet raw material is the composite pellets of spherical shell, enter the pelletizing roasting furnace and form pellet; In roasting or sintering process, realize the detoxifcation processing of chromium slag with the reducing atmosphere subenvironment of numerous globule core;
(3) described agglomerate or pellet are sent into blast furnace again, smelt iron as blast furnace raw material, and the chromium slag is thoroughly handled.
In the described step (1), in ball total raw material amount, make the chromium slag of ball and the weight percent of coal dust or coke powder and be respectively 38-88% and 10-60%, chromium slag and both weight percents of gravitational dust collection ash are respectively 5-90% and 8-93%, and the weight percent of caking agent is 1-2%; The ball diameter is 2-9mm;
In the described step (2), ball substitutes the rhombspar of producing in the flux that agglomerate need use by the amount of 1-100%, making the diameter of composite pellets be 3-16mm; The consumption of described ball accounts for the 5%-100% of agglomerate raw material or pellet raw material consumption.
Described caking agent is wilkinite or humic acids.
Described step (1) and step (2) specifically have the making method of ball and composite pellets:
1. be after chromium slag, coal dust and/or coke powder or gravitational dust collection ash, caking agent are prepared mixing, to enter tablets press, the ball that independently completes outside sintered production line is made; The tablets press formation composite pellets that ball is entered sintering mixer with the raw material of producing agglomerate and caking agent or enters pellet production line forms agglomerate or pellet again behind sinter machine or pelletizing roasting furnace roast again, enters blast furnace at last;
Perhaps, 2. in sintered production line, after chromium slag, coal dust and/or coke powder or gravitational dust collection ash, caking agent prepared mixing, send the sintering feeding warehouse to, the chromium slag feeding warehouse discharge port in the sintered material chamber installs tablets press additional, directly form ball, again ball is entered a mixing machine, two mixing machines, or directly enter two mixing machines, be mixed together with the raw material and the caking agent of agglomerate, raw material with agglomerate forms spherical shell, forms composite pellets;
Perhaps, 3. in sintered production line, chromium slag, coal dust and/or coke powder or gravitational dust collection ash, caking agent prepared mixing after, send the sintering feeding warehouse to, chromium slag feeding warehouse discharge port in the sintered material chamber, install vaporific water jet standpipe additional, directly form ball, enter a mixing machine, two mixing machines again, or directly enter two mixing machines, be mixed together with the raw material and the caking agent of agglomerate, the raw material formation spherical shell with agglomerate forms composite pellets.
Described chromium slag raw material will carry out fragmentation, oven dry before use, and water content requires: 3-7.5%, granularity requirements :-200 orders reach more than 70%.
Because handling the chromium slag can not directly handle on the sintered production line of oxidizing atmosphere, also should not be processing chromium slag and go to change the original production technique of sintered production line, therefore the present invention has adopted the mode of secondary balling-up to form and has handled the required reducing atmosphere of chromium slag, realizes the toxicide processing of chromium slag on sintered production line with the reducing atmosphere subenvironment of numerous globule core.
The mechanism that employing the inventive method is carried out chromium residue detoxifying is as follows: the sexavalent chrome in the chromium slag mainly exists with Sodium chromate and yellow ultramarine form, is example with the Sodium chromate therefore.Under sintering and iron-smelting process condition, there are reducing mediums such as C, CO in the furnace charge all the time.Under the effect of C, CO, Na
2CrO
4The reduction reaction that takes place is:
2Na
2CrO
4+C+CO＝Cr
2O
3+2CO
2+2Na
2O
Relational expression between this equilibrium constant of reaction k and the temperature of reaction:
ln?k
＝-52.720297+1552.715508/T+8.5403ln?T+0.00337862T-191095/T2
Thus relational expression as can be known, along with temperature raises, Na
2CrO
4The reduction and detoxication effect improves, and illustrates that the temperature rising helps Na
2CrO
4Reduction.Therefore no matter in sintering still is the blast furnace ironmaking process, on the thermodynamics angle, can carry out chromic reduction reaction merely.
Utilize the chromium slag under the processing condition of sintering and ironmaking, C, CO, Si, Fe all can make CrO
3Be reduced into Cr
2O
3, and C, Si can further make Cr
2O
3Be reduced into CrO and chromium metal.
Process analysis:
The half way reduction of sintering process, (hexavalent chrome reduction is a trivalent chromium).Agglomerate is the enriched ore that a kind of method that adopts high temperature sintering is made, and is one of main iron-bearing material of blast furnace ironmaking.So-called sintering, promptly be with various powdery iron-containing raw materials, allocate an amount of basic flux and fuel (coke powder, pulverized anthracite) into, mix to be placed on the agglomerating plant and burn, the a series of physical-chemical reactions of generation in the material in pyroprocess, meltable material of generating portion and liquid phase softening, that fusing forms some amount in the compound, the solid particulate wetting, that adhesion is molten on every side, the cooling after coagulation coheres the material that was diffusing shape originally become block.
Among the present invention, for under the oxidizing atmosphere that does not change sinter machine, satisfy the reducing atmosphere requirement of the chromium slag being handled needs again, the chromium slag is made ball with reductive agents such as coal dust or coke powders, carrying out the secondary balling-up with raw materials for sintering, be that raw materials for sintering is wrapped in ball and forms spherical shell outward, like this in sintering process, because the shielding effect of spherical shell, ball is when comparatively high temps, reductive agent coal dust or coke powder have subenvironment (the ball formation reducing atmosphere of reducing atmosphere one of the inner formation of spherical shell, the peripheral oxidizing atmosphere of spherical shell), make chromium carry out reduction reaction smoothly, reduction ratio can reach more than 96%.And behind the formation agglomerate,, behind blast-furnace smelting, expect blast furnace slag again by sintering with the form that the agglomerate of routine enters blast furnace, the hexavalent chrome reduction rate just can reach more than 99.5%.
As seen, the inventive method has directly been utilized metallurgy sintered and the production process blast furnace routine, under the prerequisite of the oxidizing atmosphere that does not change sintering integral body, can handle the chromium slag effectively, i.e. economy environmental protection again, and also easy to implement.
Embodiment
Embodiment 1:
The processing of chromium slag:, build a chromium slag system ball production line on the next door that the chromium slag muck of chromium salt production factory is put; With the fragmentation of chromium slag, oven dry (moisture less than 4%, ball milling reach more than 70%) to-200 orders, be 10 tons of calculations with ball raw material total amount, get 0.2 ton of 7.8 tons of chromium slag, 2 tons of coal dusts (200 order), binding agent wilkinite; Behind the mixing machine mixing, enter granulating disc, produce diameter 2-5mm ball, the work in-process behind the mistake vibratory screening apparatus, the special transport vehicle that enters sealing is delivered to the proportioning room of sintering plant, and chromium slag ball is put into the feed bin of sealing, enters sintered production line, and whole process is not down; With above 10 tons of chromium slag balls (promptly replacing rhombspar in the flux of same amount) with chromium slag ball sneak into 190 tons of agglomerating mixings ore deposits, (rhombspar in the flux is by 10 tons of former weight minimizings for flux, because substituted 1 ton by chromium slag ball) in caking agent and the fuel, together enter a mixing machine, two mixing machines, add water and secondary mixing through secondary, (or directly entering two mixing machines), outside chromium slag ball, form spherical shell, form the composite pellets of diameter 5-10mm, enter the sinter machine sintering again, the chromium slag is reduced pre-treatment; Behind the high temperature sintering more than 1200 ℃, agglomerate is come out of the stove, is cooled off, fragmentation, screening, finished product ore deposit enter next process-blast furnace ironmaking, again to the processing of thoroughly detoxifying of chromium slag.
Above sintering production process is meant the conventional production process of agglomerate, and equipment and processing condition need not change, and only need to substitute with chromium slag ball the amount of the rhombspar in the part or all of flux, and promptly adjusting, the amount of flux gets final product.
After testing: the total chromium in the raw material chromium slag is 5.1%; Sexavalent chrome is 1.5%; Total chromium of agglomerate is 0.3; Sexavalent chrome is 0.0001% (is 0.0005% less than discharging standards 5mg/kg).Reach the pretreated purpose of detoxifcation.Next step enters blast furnace and reduces processing completely, and the chromium slag is promptly by good recycling.
In addition, the chromium slag ball with upper type is independently to complete outside sintered production line.According to practical situation; chromium slag ball also can be made in sintered production line together; its method is after chromium slag, coal dust and/or coke powder or gravitational dust collection ash, caking agent are prepared mixing, to send the sintering feeding warehouse to, the chromium slag feeding warehouse discharge port in the sintered material chamber; install vaporific water jet standpipe and/or tablets press additional; directly form ball, enter a mixing machine, two mixing machines again, or directly enter two mixing machines; raw material with agglomerate forms spherical shell, forms composite pellets.
In addition, above-mentioned when making chromium slag ball, the reductive agent of use also can adopt the gravitational dust collection ash.
Embodiment 2:
The ball raw material adopts chromium slag 78.5%, coal dust 20%; Binding agent is a wilkinite 1.5%, 1 kilogram of ball weight; Make ball (diameter 5mm);
The spherical shell raw material adopts powdered iron ore 98%, ferrous grade 55%; Binding agent is wilkinite (2%); Outside ball, form spherical shell, 2 kilograms of spherical shell weight, secondary becomes spherical diameter 10mm, 3 kilograms of green-ball gross weights.
In test furnace, carry out roasting test; Experimental atmosphere is an oxidizing atmosphere; Make fuel with liquefied gas, green-ball places roasting in the stove; Take out product and carry out every detection; Total chromium in the raw material chromium slag is 5.0%; Sexavalent chrome is 1.1%; Total chromium of agglomerate is 0.3; Sexavalent chrome is 0.0001% (is 0.0005% less than discharging standards 5mg/kg).Reach the pretreated purpose of detoxifcation.
Embodiment 3:
The ball raw material adopts chromium slag 18.5%, gravitational dust collection ash 80% (the gravitational dust collection ash includes coke powder 35%); Binding agent is a wilkinite 1.5%; 1 kilogram of ball weight; Make ball (diameter 5mm); The spherical shell raw material adopts powdered iron ore (98%); Ferrous grade 63%; (not carbon containing) binding agent is wilkinite (2%); Outside ball, form spherical shell; 1 kilogram of spherical shell weight; Secondary becomes spherical diameter 8mm; 2 kilograms of gross weights; In the self-control test furnace, carry out roasting test; Experimental atmosphere is an oxidizing atmosphere; Make fuel with liquefied gas, green-ball places roasting in the stove; Take out product and carry out every detection; Total chromium in the raw material chromium slag is 5.5%; Sexavalent chrome is 1.4%; Total chromium of agglomerate is 0.45; Sexavalent chrome is 0.0002% (is 0.0005% less than discharging standards 5mg/kg).Reach the pretreated purpose of detoxifcation.
Embodiment 4:
Raw material is prepared: with chromium slag oven dry (moisture is less than 4%), broken (ball milling reaches more than 70% to-200 orders); With gravitational dust collection ash oven dry (moisture is less than 4%), broken (ball milling reaches more than 70% to-200 orders); Ball raw material total amount is got 40 tons of chromium slags, 38.4 tons of gravitational dust collection ashes, 1.6 tons of humic acidss by 80 tons of calculating.Spherical shell raw material total amount is got 2.4 tons of 117.6 tons of powdered iron ore (TFe 50%), wilkinites by 120 tons of calculating.
Secondary balling-up: (one) ball balling technique
Three feed bins are filled ironmaking gravitational dust collection ash, chromium slag, humic acids respectively, control delivery rate with disk feeder, and at the uniform velocity cloth is on conveyor.
Conveyor is sent raw material into profit mill (or stirring) in the damp mill (or machine,massing), gives balling disc through conveyor again and makes ball.
After the ball moulding, behind conveyor, vibratory screening apparatus, enter next process (spherical shell balling-up); Vibrate undersized fines and return profit mill in the damp mill.
(two) spherical shell balling technique
Two feed bins are filled powdered iron ore, wilkinite respectively, control delivery rate with disk feeder, and at the uniform velocity cloth is on conveyor.
Conveyor is sent raw material into profit mill (or stirring) in the damp mill (or machine,massing), gives balling disc through conveyor again and makes ball; The balling disc of simultaneously ball being made a gift to someone has been made spherical shell.After the spherical shell moulding, behind conveyor, vibratory screening apparatus, enter next process (roasting); Vibrate undersized fines and return profit mill in the damp mill.
Pellet roasting technology: the secondary through balling disc is made ball, through the green-ball behind the particle under the vibratory screening apparatus sieve, is given material distributing machine by conveyor again, and cloth is expected on the oven dry bed at shaft furnace top uniformly, by 570 ℃ hot blast heating.
Green-ball by oven dry, preheating gradually, slowly descends on the oven dry bed, heats up about 1 hour consuming time gradually; Roasting band at road brattice soaking zone is heated to 1150 ℃, and about 1.5 hours consuming time, progress into the cooling zone, slowly to be come out of the stove behind the twice wind cooling, the temperature when coming out of the stove is about 200 ℃, omnidistance about 6 hours consuming time altogether.
Balling-up after coming out of the stove is slowly transported on chain belt machine and is further cooled, and it was sent to vibratory screening apparatus, and the balling-up under the sieve behind the particle can enter the finished product stockyard, or directly enters next process---blast furnace ironmaking.
After testing: the total chromium in the raw material chromium slag is 5.3%; Sexavalent chrome is 1.3%; Total chromium of agglomerate is 0.36; Sexavalent chrome is 0.00015% (is 0.0005% less than discharging standards 5mg/kg).Reach the pretreated purpose of detoxifcation.Next step enters blast furnace and reduces processing completely, and the chromium slag is promptly by good recycling.
Claims (3)
1. utilize metallurgy sintered and blast furnace to the method that the chromium slag carries out harmless treatment, said method comprising the steps of:
(1) being raw material, being reductive agent with coal dust, coke powder and/or gravitational dust collection ash with the chromium slag, is additive with the caking agent in addition, makes ball;
(2) described ball being made with the agglomerate raw material with the raw material of producing agglomerate and caking agent is the composite pellets of spherical shell, enters sinter machine and carries out sintering, forms agglomerate; Or described ball is entered the pellet production line make with pellet raw material and caking agent and think that pellet raw material is the composite pellets of spherical shell, enter the pelletizing roasting furnace and form pellet; In roasting or sintering process, realize the detoxifcation of chromium slag is handled with the reducing atmosphere subenvironment of numerous composite pellets kernel;
(3) described agglomerate or pellet are sent into blast furnace again, smelt iron, the chromium slag is thoroughly handled as blast furnace raw material;
In the described step (1), in ball total raw material amount, make the chromium slag of ball and the weight percent of coal dust and/or coke powder and be respectively 38-88% and 10-60%, chromium slag and both weight percents of gravitational dust collection ash are respectively 5-90% and 8-93%, and the weight percent of caking agent is 1-2%; The ball diameter is 2-9mm;
In the described step (2), ball substitutes the rhombspar of producing in the flux that agglomerate need use by the amount of 1-100%, and the diameter of the composite pellets of making is 3-16mm;
The consumption of described ball accounts for the agglomerate raw material of making spherical shell or the 5%-100% of pellet raw material consumption;
Described chromium slag raw material will carry out fragmentation, oven dry before use, and water content requires: 3-7.5%, granularity requirements :-200 orders reach more than 70%.
2. according to claim 1ly utilize metallurgy sintered and blast furnace to the method that the chromium slag carries out harmless treatment, it is characterized in that: described caking agent is wilkinite or humic acids.
3. according to claim 1 and 2ly utilize metallurgy sintered and blast furnace, it is characterized in that the method that the chromium slag carries out harmless treatment:
Described step (1) and step (2) specifically have the making method of ball and composite pellets:
1. after chromium slag, reductive agent coal dust, coke powder and/or gravitational dust collection ash, caking agent being prepared mixing, enter tablets press, the ball that independently completes outside sintered production line is made; The tablets press that again ball is entered sintering mixer with the raw material of producing agglomerate and caking agent or enter pellet production line forms composite pellets;
Perhaps, 2. in sintered production line, after chromium slag, coal dust and/or coke powder or gravitational dust collection ash, caking agent prepared mixing, send the sintering feeding warehouse to, the chromium slag feeding warehouse discharge port in the sintered material chamber installs tablets press additional, directly form ball, again ball is entered a mixing machine, two mixing machines, or directly enter two mixing machines, be mixed together with the raw material and the caking agent of agglomerate, raw material with agglomerate forms spherical shell, forms composite pellets;
Perhaps, 3. in sintered production line, chromium slag, coal dust and/or coke powder or gravitational dust collection ash, caking agent prepared mixing after, send the sintering feeding warehouse to, chromium slag feeding warehouse discharge port in the sintered material chamber, install vaporific water jet standpipe additional, directly form ball, enter a mixing machine, two mixing machines again, or directly enter two mixing machines, be mixed together with the raw material and the caking agent of agglomerate, the raw material formation spherical shell with agglomerate forms composite pellets.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102538658A CN101705317B (en) | 2009-09-14 | 2009-12-01 | Harmless process method for chrome slag by utilizing metallurgy sintering and blast furnace |
| PCT/CN2010/001358 WO2011029269A1 (en) | 2009-09-14 | 2010-09-07 | Method for innocuously treating chromium residue using metallurgical roasting and blast furnace |
| RU2012108937/02A RU2551729C2 (en) | 2009-09-14 | 2010-09-07 | Method of chromium slag neutralisation using annealing method and blast-furnace process |
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|---|---|---|---|
| CN200910190855 | 2009-09-14 | ||
| CN200910190855.4 | 2009-09-14 | ||
| CN2009102538658A CN101705317B (en) | 2009-09-14 | 2009-12-01 | Harmless process method for chrome slag by utilizing metallurgy sintering and blast furnace |
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| CN101705317A CN101705317A (en) | 2010-05-12 |
| CN101705317B true CN101705317B (en) | 2011-06-29 |
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| CN101942571B (en) * | 2010-09-06 | 2014-10-22 | 重庆瑞帆再生资源开发有限公司 | Method for innocently treating and recycling chromium residues and metallurgical waste material |
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| CN112853091B (en) * | 2020-12-31 | 2022-03-29 | 中南大学 | Method for efficiently and synergistically recycling chromium-containing waste residues and carbon-containing waste materials |
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| CN1059370A (en) * | 1990-08-31 | 1992-03-11 | 黄石市无机盐厂 | Chromium residue detoxifying, smelting contain the method for chromium pig iron |
| CN101265508A (en) * | 2007-03-16 | 2008-09-17 | 天津市大钧科技开发有限公司 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
-
2009
- 2009-12-01 CN CN2009102538658A patent/CN101705317B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059370A (en) * | 1990-08-31 | 1992-03-11 | 黄石市无机盐厂 | Chromium residue detoxifying, smelting contain the method for chromium pig iron |
| CN101265508A (en) * | 2007-03-16 | 2008-09-17 | 天津市大钧科技开发有限公司 | Harmless resource treatment method for chromium slag by using blast furnace iron-making technique |
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